SAN MATEO, Calif., June 18, 2012 (GLOBE NEWSWIRE) -- NeurogesX, Inc. (Nasdaq:NGSX), a specialty pharmaceutical company focused on developing and commercializing a portfolio of novel non-opioid, pain management therapies, today announced the Japanese Patent Office (JPO) has issued patent No. 4931128 to NeurogesX for its next generation product candidate NGX-1998, a topically applied liquid formulation of prescription strength capsaicin designed to treat pain associated with neuropathic pain conditions. The patent, entitled "Methods and Compositions for Administration of TRPV1 Agonists," will remain in effect in Japan until 2024. The issued claims include formulation, system, and kit claims.